Update docs/chapter_searching/hashing_search.md
Co-authored-by: Justin Tse <xiefahit@gmail.com>
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```typescript title="hashing_search.ts"
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/* 哈希查找(数组) */
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function hashingSearch(map: Map<number, number>, target: number) {
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function hashingSearch(map: Map<number, number>, target: number): number {
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// 哈希表的 key: 目标元素,value: 索引
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// 若哈希表中无此 key ,返回 -1
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return map.has(target) ? map.get(target) : -1;
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return map.has(target) ? map.get(target) as number : -1;
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}
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```
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